CVE-2023-29405
CWE-74Published: June 8, 2023· Updated: Jun 17, 2026
Official Description
The go command may execute arbitrary code at build time when using cgo. This may occur when running "go get" on a malicious module, or when running any other command which builds untrusted code. This is can by triggered by linker flags, specified via a "#cgo LDFLAGS" directive. Flags containing embedded spaces are mishandled, allowing disallowed flags to be smuggled through the LDFLAGS sanitization by including them in the argument of another flag. This only affects usage of the gccgo compiler.
Risk Analysis
The Go command is vulnerable to arbitrary code execution during build time when using cgo with the gccgo compiler. Malicious modules can smuggle disallowed linker flags through the LDFLAGS sanitization process.
No public exploit is known, and the vulnerability is not in the KEV catalog. It is remotely exploitable with low attack complexity.
Update the Go toolchain to the latest version and avoid building untrusted modules.
Technical Analysis
CVE-2023-29405 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (15)
Quick Facts
Related CVEs (CWE-74)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2023-29405 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts